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Measure frequency lower than sampling rate - how?

 We need to acquire the frequency signal and log the data  at 10ms(100Hz)   which is varying from 0-10kHz in 200ms.

The problem Facing  : Form frequency 400Hz to 0 Hz the time loop takes more time than 10 ms  .It is because the divisor is 4  so the value at that frequency takes more time in reading making the time loop finish late.

Is there any other method or technique by which we could get value at any frequency from 0 -10khz without the time loop taking more time than 10ms.

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How can you measure a signal with a period greater than 10ms in less than 10ms?

 

You can't. 

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